@charset 'utf-8';

* {
  margin: 0;
  padding: 0;
}

body {
  background-color: #fafafa;
  font-family: 'Microsoft YaHei', Helvetica, Arial, sans-serif;
}
.calculator {
  position: absolute;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: #fafafa;
}
.calculator .calc-screen {
  position: absolute;
  width: 100%;
  height: 34%;
  font-size: .4rem;
}
.calc-screen .calc-result {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 10px;
  width: 96%;
  margin: auto;
  min-height: .4rem;
  text-align: right;
  white-space: nowrap;
  color: #666;
  line-height: .4rem;
}
.calc-result .data {
  display: inline-block;
  position: absolute;
  right: 0;
  transform-origin: right bottom;
  transition: transform 200ms ease-in-out;
}
.calculator .calc-buttons {
  position: absolute;
  bottom: 0;
  width: 100%;
  height: 66%;
  display: flex;
  flex-wrap: wrap;
}
.calc-buttons .buttons {
  flex: 1 25%;
  width: 25%;
  height: 20%;
  outline: 0;
  font-size: .22rem;
  font-family: 'Microsoft YaHei', Helvetica, Arial, sans-serif;
  color: #666;
  background: #fff;
  border: 1px solid #eee;
  cursor: pointer;
  -webkit-appearance: none;
}
.calc-buttons .buttons:active {
  background-color: #77ff89;
  color: #fff;
}
.calc-buttons .buttons.equals {
  color: #fff;
  background-color: #0d1;
}
.calc-buttons .buttons.equals:active {
  background-color: #77ff89;
}
@media screen and (min-width: 1025px) {
  .calculator {
    max-width: 500px;
    left: 50%;
    margin-left: -250px;
    box-shadow: 0 4px 20px 10px rgba(238, 238, 238, .75);
  }
}